diberry - 4:13 am on May 26, 2013 (gmt 0)
I wonder how many queries this is happening on. For the ones that matter to my sites, it looks like the algo is first splitting the SERPs between recognizable brands and indie sites and THEN considering factors like relevance and spammy backlinks and so on. If that's true, then nothing I've learned about SEO matters: all that matters is becoming a recognizable brand.
I can't begin to guess if this has anything to do with Penguin or just the rest of the algo, but it looks clearer than ever since they announced Penguin 2.0.